CAPILLARY ELECTROPHORETIC SEPARATION OF INORGANIC AND ORGANIC ARSENICCOMPOUNDS

Capillary zone electrophoresis was used to separate arsenite, arsenate , dimethylarsinic and diphenylarsinic acid, methanearsonic acid, pheny l- and p-aminophenyl arsonic acid, phenylarsineoxide and phenarsazinic acid. Anionic and uncharged species were separated in a fused silica capillary with on-column UV detection at 200 nm. A 15 mM phosphate sol ution adjusted to pH 6.5 containing 10 mM sodium dodecylsulfonate serv ed as background electrolyte. The influence of pH and applied voltage on separation efficiency, as well as the feasibility of identification of arsenic compounds in spiked urine, were investigated.